A water jet device, water cutting machine and method for cutting a coal gas overlap zone oil and gas well

Abstract

The application discloses a water cutting device, a water cutting machine and a method for cutting a kerosene gas superimposed area oil and gas well, which comprises a clamp component, a connecting rod component, a water spraying pipe head and a connecting water pipe; the clamp component adjusts its inner diameter size according to the outer diameter size of the oil and gas well, so that the clamp component can tightly clamp on the outer circumferential surface of the oil and gas well; the connecting rod component is composed of a connecting part and a rotating part which can rotate in the circumferential direction on the connecting part; the connecting part is fixedly connected with the clamp component; the water spraying pipe head is inserted into the rotating part, and the high-pressure water column emitted from the water spraying pipe head can vertically hit the outer circumferential surface of the oil and gas well, so that the oil and gas well is horizontally cut; the water spraying pipe head is connected with a high-pressure device through the connecting water pipe, and an operator swings the connecting water pipe to drive the water spraying pipe head to swing, so as to form a fan-shaped cross-section spraying area. The application utilizes the water cutting device to cut the oil and gas well pipeline without spark generation, has high safety coefficient and is more in line with the safety requirement of the coal mine underground.

Description

Technical Field

[0001] This invention relates to a waterjet cutting device for cutting oil and gas wells in coal-oil-gas stacked areas, belonging to the technical field of waterjet cutting machines. Background Technology

[0002] The Ordos Basin, Tarim Basin, and Junggar Basin in my country are comprehensive resource basins where multiple mineral resources, such as coal, oil, and gas, overlap vertically. Currently, coal and oil / gas resource development is still primarily focused on a single mineral (or single industry). This single-development model, prioritizing either oil / gas or coal, not only results in significant waste of various associated minerals but also leads to mutual interference between coal and oil / gas during extraction. Since coal seams are located in shallow strata while oil / gas layers are located deep underground (below the coal seam), abandoned vertical oil / gas wells may be exposed during coal mine operations. In such cases, proper methods are needed to cut the oil / gas well pipelines to ensure the safe and smooth extraction of coal resources. This method is crucial for achieving coordinated extraction of upper coal seams and lower oil / gas resources.

[0003] Currently, angle grinders are commonly used to cut oil and gas wells. However, angle grinders generate sparks during the cutting process, posing a significant safety hazard and failing to meet the safety requirements for underground coal mine operations. Furthermore, the friction between the angle grinder and the oil and gas well produces waste smoke and fumes, which do not meet environmental protection requirements. In fact, long-term inhalation of these waste smoke and fumes by operators can cause harm to their health. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a water jet device and method for cutting oil and gas wells in coal-oil-gas interlocking zones. Compared to traditional angle grinder cutting, water jet cutting of oil and gas well pipelines produces no sparks, has a high safety factor, and better meets the safety requirements of underground coal mines. At the same time, operators can remotely control the equipment, improving safety and further reducing labor intensity. The water jet cutting process does not produce waste smoke or gas, and the only consumables are water and sand, which meets environmental protection requirements.

[0005] This invention is implemented according to the following technical solution:

[0006] In a first aspect, the present invention provides a water jet cutting device for cutting oil and gas wells in coal-oil-gas stacked zones, comprising:

[0007] The clamp component adjusts its inner diameter according to the outer diameter of the oil and gas well, so that the clamp component can be tightly clamped to the outer circumference of the oil and gas well.

[0008] The connecting rod assembly comprises a connecting part and a rotating part capable of circumferential rotation on the connecting part; wherein the connecting part is fixedly connected to the clamp assembly;

[0009] The water jet head is inserted into the rotating part, and the water jet from the water jet head can vertically hit the outer circumferential surface of the oil and gas well, so that it can horizontally cut the oil and gas well.

[0010] The water pipe is connected to the high-pressure water outlet equipment. The operator swings the water pipe to make the water pipe head swing together, thereby forming a fan-shaped spray area.

[0011] In some embodiments, the clamp component includes:

[0012] A flexible connector that can be wound around the outer circumferential surface of the oil and gas well;

[0013] A rigid connector has an arc-shaped side facing the oil and gas well, which is used to fit against the outer circumferential surface of the oil and gas well. One lateral end of the rigid connector is hinged to one free end of the flexible connector, and the other lateral end of the rigid connector is provided as a snap-fit ​​part.

[0014] A locking component is connected between the other free end of the flexible connector and the snap-fit ​​part, used to adjust the inner diameter of the ring formed by the flexible connector and the rigid connector, and to lock the flexible connector and the rigid connector on the outer circumferential surface of the oil and gas well.

[0015] In some embodiments, the locking component includes:

[0016] A threaded column, one end of which is hinged to the flexible connector, and the middle part is engaged in the engagement part with a clearance fit between them;

[0017] The threaded sleeve consists of a hollow internally threaded sleeve and a handle, and has an overall T-shaped structure. The internally threaded sleeve is screwed into the threaded post. Rotating the handle causes the internally threaded sleeve to rotate together. Under the action of the internal and external threads, the internally threaded sleeve converts the circumferential rotational motion into axial linear motion to push the clamping part toward the oil and gas well, thereby clamping the flexible connector and the rigid connector onto the outer circumferential surface of the oil and gas well.

[0018] In some embodiments, the rigid connector is integrally cast or welded from a right-angled triangular plate with a concave arc side and a U-shaped clamping plate located at the right angle of the right-angled triangular plate, and the U-shaped clamping plate serves as the clamping part; the central area of ​​the right-angled triangular plate is provided with a through hole for cooperating with the connecting rod component, and a hinge hole is provided at one acute angle of the right-angled triangular plate for inserting a pin and hinged to the flexible connector.

[0019] In some embodiments, the linkage component includes:

[0020] a vertically arranged connecting rod, the top of which is connected to the clamping component by a first fastener;

[0021] a horizontally arranged support rod, one end of which is fixed to the bottom of the connecting rod;

[0022] a vertically arranged rotating rod, which is located below the support rod, the top of the rotating rod is connected to the middle region of the support rod by a second fastener, and the rotating rod can rotate circumferentially around its center point; the middle region of the outer circumferential surface of the rotating rod is provided with a radial through hole, and the water jet pipe head is inserted into the radial through hole and fixed by a third fastener.

[0023] In some embodiments, the top of the connecting rod is provided with a stepped head with external threads, which is inserted into the through hole of the clamping component from bottom to top; the first fastener is a nut, which is screwed onto the stepped head to abut the shoulder of the stepped head against the clamping component, thereby fixing the connecting rod and the clamping component together.

[0024] In some embodiments, the middle region of the support rod is provided with a vertically arranged through hole, and the central region of the axial top surface of the rotating rod is provided with an axial internal thread blind hole coaxially arranged with the through hole; the second fastener is a screw, the threaded shank of which is inserted into the through hole from top to bottom and tightly abuts in the axial internal thread blind hole; the threaded shank of the screw is clearance fit with the through hole, and the length of the threaded shank of the screw is greater than the depth of the through hole and the axial internal thread blind hole added together, so that the rotating rod and the screw can axially move on the support rod, thereby realizing the circumferential rotation function of the rotating rod; the central region of the axial bottom surface of the rotating rod is provided with an axial internal thread mounting hole communicating with the radial through hole; the third fastener is a screw, the threaded shank of which is screwed into the axial internal thread mounting hole and tightly abuts against the water jet pipe head, thereby fixing the water jet pipe head with the adjusted spacing between the end of the water jet pipe head and the outer circumferential surface of the oil and gas well on the rotating rod.

[0025] In a second aspect, the present application provides a cutting method for the water jet device for cutting the oil and gas well in the coal oil and gas superimposed area based on the above:

[0026] Determine the pre-cutting position on the outer circumferential surface of the oil and gas well and mark the cutting position;

[0027] Clamp the clamping component on the oil and gas well above the cutting position mark;

[0028] Adjust the position of the connecting rod component and fix it on the clamping component;

[0029] Adjust the spacing between the water jet pipe head and the outer circumferential surface of the oil and gas well and fix it on the connecting rod component;

[0030] Two operators are needed when cutting, one is responsible for operating high pressure equipment and observing its running state, and the other is responsible for cutting;

[0031] When the water inlet valve is opened, the water jet head has water flow, and the high pressure water outlet device is started, and when the mortar jet flow is basically formed, cutting is started, and in the cutting process, the operator forms a fan-shaped jet flow by swinging the connected water pipe to form a straight jet flow;

[0032] After cutting, the cut of the oil and gas well is sealed to prevent gas leakage.

[0033] In a third aspect, the present application provides a water cutting machine, comprising a high pressure water outlet device and the water jet device for cutting the oil and gas well in the oil and gas superimposed area.

[0034] In a fourth aspect, the present application provides a construction method based on the above-mentioned water cutting machine, mainly comprising the following steps:

[0035] Step one, preparation work before oil and gas well casing uncovering;

[0036] Step two, oil and gas well exploration and uncovering in the process of coal mine working face pushing and mining;

[0037] Step three, transportation of underground water cutting machine;

[0038] Step four, preparation before installation of water cutting machine;

[0039] Step five, installation of underground water cutting machine;

[0040] Step six, test of underground water cutting machine;

[0041] Step seven, cutting of underground oil and gas pipeline;

[0042] Step eight, recovery of underground water cutting machine.

[0043] Compared with the prior art, the present application has the following beneficial effects:

[0044] Compared with the traditional angle grinder cutting method, the water jet cutting of the oil and gas well pipeline does not produce sparks, has high safety factor, and is more in line with the safety requirements of coal mine operation.

[0045] Compared with the traditional angle grinder cutting method, the water jet cutting of the oil and gas well pipeline can be remotely controlled by the operator, improving safety and further reducing labor intensity.

[0046] Compared with the traditional angle grinder cutting method, the water jet cutting of the oil and gas well pipeline does not produce waste smoke and gas, and the consumables are only water and sand, which meets the environmental protection requirements.

[0047] The water cutting machine provided by the application can make the coal mining face smoothly push and mine, realize the smooth mining of the upper coal seam in the coal and oil gas superimposed area, and form a safe and reliable coal mining pattern with comprehensive utilization. BRIEF DESCRIPTION OF DRAWINGS

[0048] The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide further understanding of the application, its exemplary embodiments, and its description serve to explain the application without imposing undue limitation on the application. Obviously, the accompanying drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of the drawings.

[0049] In the drawings:

[0050] Figure 1 The overall structure of the water jet device for cutting the oil and gas well in the coal and oil gas superimposed area according to the application Figure 1 ;

[0051] Figure 2 The overall structure of the water jet device for cutting the oil and gas well in the coal and oil gas superimposed area according to the application Figure 2 ;

[0052] Figure 3 The overall structure of the water jet device for cutting the oil and gas well in the coal and oil gas superimposed area according to the application

[0053] Figure 4 The partial cross-section of the water jet device for cutting the oil and gas well in the coal and oil gas superimposed area according to the application Figure 1 ;

[0054] Figure 2 The partial cross-section of the water jet device for cutting the oil and gas well in the coal and oil gas superimposed area according to the application Figure 6 ;

[0055] Figure 1 The overall structure of the rigid connecting piece according to the application (a is a perspective view, and b is a top view).

[0056] The accompanying drawings: 1 - clamp part, 2 - connecting rod part, 3 - water jet pipe head, 4 - connecting water pipe, 5 - oil and gas well

[0057] 11 - flexible connecting piece, 12 - rigid connecting piece, 13 - locking part

[0058] 121 - right-angled triangular plate, 122 - U-shaped clamping plate, 123 - through hole, 124 - hinge hole

[0059] 131 - threaded column, 132 - threaded sleeve

[0060] 21 - connecting rod, 22 - support rod, 23 - rotating rod;

[0061] 211 - nut, 221 - screw, 231 - screw.

[0062] It should be noted that the drawings and the detailed description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0063] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but are not used to limit the scope of the present application.

[0064] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0065] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0066] As Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 1As shown in the figure, a water jet device for cutting oil and gas well in oil and gas superimposed area comprises a hoop component 1, a connecting rod component 2, a water jet pipe head 3 and a connecting water pipe 4; the hoop component 1 adjusts its inner diameter size according to the outer diameter size of the oil and gas well 5, so that the hoop component 1 can tightly clamp on the outer circumferential surface of the oil and gas well 5; the connecting rod component 2 is composed of a connecting part and a rotating part which can rotate in the circumferential direction on the connecting part; wherein the connecting part is fixedly connected with the hoop component 1; the water jet pipe head 3 is inserted in the rotating part, and the water column shot from the water jet pipe head 3 can vertically hit on the outer circumferential surface of the oil and gas well 5, so as to horizontally cut the oil and gas well 5; the water jet pipe head 3 is connected in communication with the high-pressure water outlet equipment through the connecting water pipe 4, and the operator swings the connecting water pipe 4 to drive the water jet pipe head to swing, thereby forming a fan-shaped cross-section jetting area.

[0067] The specific structure of the hoop component is further described below.

[0068] As shown in the figure, Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 1 The hoop component 1 comprises a flexible connecting piece 11, a rigid connecting piece 12 and a locking component 13; the flexible connecting piece 11 can be wound on the outer circumferential surface of the oil and gas well 5; the rigid connecting piece 12 is arc-shaped towards the side vertical surface of the oil and gas well 5, for fitting on the outer circumferential surface of the oil and gas well 5, and the transverse one end of the rigid connecting piece 12 is hingedly connected with one free end of the flexible connecting piece 11, and the transverse other end of the rigid connecting piece 12 is provided as a clamping part; the locking component 13 is connected between the other free end of the flexible connecting piece 11 and the clamping part, for adjusting the inner diameter size of the circular ring formed by the flexible connecting piece 11 and the rigid connecting piece 12, and locking the flexible connecting piece 11 and the rigid connecting piece 12 on the outer circumferential surface of the oil and gas well 5.

[0069] It should be noted that a preferred embodiment of the flexible connecting piece 11 is shown in the figure, i.e. a chain. Of course, in actual use, the flexible connecting piece 11 is not limited to the chain, but can also be a steel wire rope.

[0070] The specific structure of the hoop component is further described below.

[0071] As shown in the figure, Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6As shown, the locking component 13 includes a threaded post 131 and a threaded sleeve 132; one end of the threaded post 131 is hinged to the flexible connector 11, and the middle part is engaged in the engagement part with a clearance fit between the two; the threaded sleeve 132 consists of a hollow internal threaded sleeve and a handle, and the whole is in a T-shaped structure. The internal threaded sleeve is screwed into the threaded post 131. After rotating the handle, the internal threaded sleeve is driven to rotate together. Under the action of the internal and external threads, the internal threaded sleeve converts the circumferential rotational motion into axial linear motion to push the engagement part to move toward the oil and gas well, thereby clamping the flexible connector 11 and the rigid connector 12 on the outer circumferential surface of the oil and gas well 5.

[0072] The following provides a further explanation of the specific structure of the rigid connector described above.

[0073] like Figure 1 As shown, the rigid connector 12 is integrally cast or welded from a right-angled triangular plate 121 with a concave arc edge on the hypotenuse and a U-shaped clamping plate 122 located at the right angle of the right-angled triangular plate 121. The U-shaped clamping plate 122 is used as a clamping part. The central area of ​​the right-angled triangular plate 121 is provided with a through hole 123 for use with a connecting rod component, and a hinge hole 124 is provided at one acute angle of the right-angled triangular plate 121 for inserting a pin and hinged to the flexible connector 11.

[0074] The following provides a further explanation of the specific structure of the aforementioned connecting rod component.

[0075] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , ​ As shown, the connecting rod component 2 includes a vertically arranged connecting rod 21, a horizontally arranged support rod 22, and a vertically arranged rotating rod 23. The top of the connecting rod 21 is connected to the clamp component 1 by a first fastener. One end of the support rod 22 is fixed to the bottom of the connecting rod 21. The rotating rod 23 is located below the support rod 22, and the top of the rotating rod 23 is connected to the middle region of the support rod 22 by a second fastener. The rotating rod 23 can rotate circumferentially around its center point. A radial through hole is provided in the middle region of the outer circumferential surface of the rotating rod 23. The water spray head 3 is inserted into the radial through hole and fixed by a third fastener.

[0076] In a further embodiment, the top of the connecting rod 21 is provided as a stepped head with external threads, which is inserted from bottom to top into the through hole 123 of the right-angled triangular plate 121; the first fastener is a nut 211, which is screwed onto the stepped head, so that the shoulder at the stepped head abuts against the right-angled triangular plate 121, thereby fixing the connecting rod 21 and the right-angled triangular plate 121 together.

[0077] Further, a vertical through hole is formed in the middle region of the support rod 22, and an axial inner threaded blind hole coaxially arranged with the through hole is arranged in the central region of the axial top surface of the rotating rod 23; the second fastener is a screw 221, the threaded rod of which is inserted into the through hole from top to bottom and is tightly pressed in the axial inner threaded blind hole; the threaded rod of the screw 221 is gap-fitted with the through hole, and the length of the threaded rod of the screw 221 is greater than the depth of the through hole and the axial inner threaded blind hole added together, so that the rotating rod 23 and the screw 221 can axially move on the support rod 22, thereby realizing the circumferential rotation function of the rotating rod 23.

[0078] Further, an axial inner threaded mounting hole communicated with the radial through hole is arranged in the central region of the axial bottom surface of the rotating rod 23; the third fastener is a screw 231, the threaded rod of which is screwed into the axial inner threaded mounting hole and is tightly pressed on the water jet pipe head 3, thereby fixing the water jet pipe head 3 with the adjusted spacing between the end of the water jet pipe head 3 and the outer circumferential surface of the oil and gas well 5 on the rotating rod 23.

[0079] In summary, the water jet device for cutting the oil and gas well in the coal oil and gas superimposed area provided by the application has the advantages that, compared with the traditional angle grinder cutting mode, the water jet cutting of the oil and gas well pipeline does not produce sparks, has a high safety factor, is more in line with the safety requirements of the coal mine underground, and can be remotely controlled by the operator, thereby further reducing the labor intensity; no waste smoke and waste gas is generated in the water jet cutting process, and the consumables are only water and sand, which meets the environmental protection requirements.

[0080] The application further provides a cutting method based on the water jet device for cutting the oil and gas well in the coal oil and gas superimposed area, and the specific content is as follows:

[0081] The position of the pre-cutting is determined on the outer circumferential surface of the oil and gas well, and a cutting position mark is made;

[0082] The clamp part is clamped on the oil and gas well above the cutting position mark;

[0083] After the position of the connecting rod part is adjusted, the connecting rod part is fixed on the clamp part;

[0084] After the spacing between the water jet pipe head and the outer circumferential surface of the oil and gas well is adjusted, the water jet pipe head is fixed on the connecting rod part;

[0085] Two operators are needed during cutting, one of whom is responsible for operating the high-pressure equipment and observing the running state thereof, and the other of whom is responsible for cutting;

[0086] The water inlet valve is opened, the water jet pipe head has water flow ejected, the high-pressure equipment is started, and cutting is started when the mortar jet flow is basically formed; during the cutting process, the operator forms a fan-shaped jet flow by swinging the water pipe connected;

[0087] After the cutting is completed, the cut of the oil and gas well is plugged to prevent gas leakage.

[0088] The water cutting machine provided by the present application is described below, and the water cutting machine described below can be correspondingly referred to the water jet device for cutting the oil and gas well in the oil and gas superimposed area described above.

[0089] The water cutting machine provided by the present application can include the water jet device for cutting the oil and gas well in the oil and gas superimposed area as described in any one of the above embodiments.

[0090] The beneficial effects achieved by the water cutting machine provided by the present application are consistent with the beneficial effects achieved by the water jet device for cutting the oil and gas well in the oil and gas superimposed area provided by the present application, and thus will not be described here.

[0091] The present application also provides a construction method based on the above-mentioned water cutting machine, and the specific content is as follows:

[0092] Step one, preparation work before the oil and gas well pipe is exposed

[0093] According to the geological data, the observation of the water spraying condition of the coal wall and roof near the oil and gas well is strengthened every shift at the position 50m from the working face to the oil and gas well, and the abnormal condition is reported in time.

[0094] The maintenance work of the hydraulic support in the influence area of the oil and gas well is well done, so that the support does not have the phenomena of self-discharge, liquid channeling, leakage, etc., and the initial support force of all supports must meet the specified requirements.

[0095] The personnel on the downwind side of the working face, the air return crossheading and the air return roadway are evacuated before the operation, and a warning line must be set at the position 30m before and after the construction point. The personnel unrelated to the construction are strictly prohibited to enter the inside of the warning line, and the operation personnel must not stand directly below the orifice. Meanwhile, the electrical equipment on the working face is checked to have no misfire, and the operation is performed after the confirmation of the good condition.

[0096] The anchor net is prepared, and if the site roof is not perfect, the anchor net must be used to back up the roof and supplement the initial support force to prevent the roof from leaking during the cutting process. The equipment is checked to be in good condition and have no water leakage phenomenon before the cutting operation, and the operation is performed after the confirmation of the correctness.

[0097] Step two, oil and gas well exploration and exposure during the pushing and mining process

[0098] According to the position of the oil and gas well, the oil and gas well borehole and the initial exploration line are marked at the corresponding positions of the rubber transport and the air return crossheading when the working face is 50m away.

[0099] After the initial exploration line is reached, mark the oil and gas well drilling position on the corresponding coal wall of the working face. When the remaining exposure distance of the working face is 5 m, start using a hand-held pneumatic drill to explore the specific position of the oil and gas well pipe, and drill a position exploration hole from the working face to the push-mining direction. At the same time, reduce the working face push-mining cycle progress to 0.5 m. When the remaining exposure distance of the working face is 0.5 m or less, strictly prohibit forward push-mining.

[0100] According to the on-site determination of the oil and gas well pipe position, mark the outline line position on both sides of the pipe (the outline line is 0.3-0.5 m away from the center line of the pipe). Use the coal mining machine to break and transport the coal wall on both sides of the pipe outline line, and manually break the coal around the oil and gas well pipe using a pneumatic pick.

[0101] Step three, transportation of the underground water cutting machine

[0102] Before transporting the water cutting machine into the well, arrange a person to check its integrity. Use a forklift to stably hoist the water cutting machine into the compartment of the explosion-proof engineering vehicle, and fix it reliably; before starting the explosion-proof material vehicle, the driver must wait for all personnel to evacuate outside the range of 5 m before starting the explosion-proof material vehicle.

[0103] When loading and unloading the water cutting machine, the explosion-proof material vehicle must be stopped stably, and the driver must give a signal that personnel can approach the vehicle for operation; when the explosion-proof material vehicle is running in the roadway, the "no walking while driving, no driving while walking" system must be strictly implemented.

[0104] When the explosion-proof material vehicle breaks down, the driver should stop immediately, apply the parking brake, turn on the double-flash warning light, prevent the vehicle from being blocked, and place a reflective triangular warning sign 30-60 m behind the vehicle. Report to the mine dispatching room in a timely manner.

[0105] Step four, preparation before installation of the water cutting machine

[0106] Place the water cutting machine on a relatively flat section of the roadway and make sure it is stable. Ensure that the water inlet temperature is between 0°C and 50°C, the water inlet flow is less than or equal to 22 liters per minute, the cable is a 660-volt 10-square-millimeter cable, the diameter of the cable entering the junction cavity matches the hole diameter of the sealing ring. At the same time, prepare the corresponding high and low pressure hoses, auxiliary cutting devices and water knife devices.

[0107] Step five, installation of the underground water cutting machine

[0108] Open the upper cover of the water cutting machine, and pass the cable through the hole on the left side plate to connect with the motor.

[0109] Connect the water pipe from the adjacent hydraulic support, select the DN10 variable DN25 variable head, the male head is DN25, and connect with the water cutting machine to ensure that the water pressure and flow are within the specified range; Connect the external water source to the low-pressure hose with the connector; Remove the dust plug at the water inlet valve, insert the low-pressure hose connector, and insert the buckle to connect the low-pressure hose connector to the quick pull rod at the equipment water inlet valve.

[0110] Connect the high-pressure hose, insert the high-pressure quick connector at one end of the high-pressure hose into the high-pressure quick connector of the equipment, and tighten it (if it gets stuck, gently shake the high-pressure quick connector); Connect the high-pressure quick connector at the other end of the high-pressure hose to the high-pressure quick connector at the water jet device.

[0111] Fill the abrasive: rotate the upper valve body of the sand slurry mixing device (tighten clockwise and loosen counterclockwise), and fill the hopper on the tank opening; Clean the tank opening, tighten the upper valve body and pressure relief valve. The surface of the tank opening and the groove of the sealing ring should be washed clean to prevent the working medium from leaking and affecting the service life of the O-shaped rubber sealing ring; At the same time, ensure that no foreign matter enters the system to prevent the water jet pipe head of the water jet device from being blocked.

[0112] Step six, underground water cutting machine test

[0113] After transporting the water cutting machine to the designated location with the transport machine, confirm that all parts of the water cutting machine are complete, without missing or damage. Check if the safety equipment is in good condition and working properly. Ensure stable power supply, good contact, and intact cable. Check if the spray water pipe at the hydraulic support provides water normally, and the water pressure meets the minimum pressure required by the water cutting machine. Connect the power supply required by the equipment, which is 660V power supply. Connect the water source correctly to ensure no leakage.

[0114] Perform an empty load test run: First, confirm that the "high pressure" and "emergency stop" buttons are functioning properly, then run the water pump, check if the pressure gauge on the water pump can reach the minimum pressure required by the equipment, and finally run the pump motor for no less than 5 minutes. Check if there are any leakage points in the system.

[0115] Perform a high-pressure water test run: First, remove the water jet pipe head at the cutting end. Adjust the overflow valve to reduce system pressure to avoid damaging the sealing device due to sudden pressure increase, then run the low-pressure water pump until water flows out of the water jet pipe head, then stop the water pump. Start the high-pressure button to make water flow out of the water jet pipe head and continue for a period of time. Install the water jet pipe head, slowly adjust the overflow valve to increase system pressure, and check if the water jet pipe head and the connection are leaking after each increase. During the test run, observe the pressure gauge, gradually increase the system pressure, and check the water jet pipe head and the connection for leaks multiple times. If leaks or abnormalities are found, stop the test run immediately, investigate and solve the problem.

[0116] Step seven, underground oil and gas pipeline cutting

[0117] Before high pressure water cutting, the hydraulic cutting machine pump body is fixed firmly with a reflective tape. Two operators are needed during cutting, one responsible for cutting and the other for observing the main machine operation. The water inlet valve is opened, and the water jet pipe head has water flow, which can prepare to start. When the mortar jet is basically formed, cutting begins. During operation, no one is allowed to enter, and after cutting, the upper and lower ends are sealed to prevent pipe sliding or gas leakage. The pipeline is fixed on the transport machine chute and transported out of the working face.

[0118] Step eight, recovery of the downhole water cutting machine

[0119] When recovering the water cutting machine, the same inverted chain lifting is used, and a trial lifting operation is carried out. After confirming that there is no error, it can be formally lifted and placed on the vehicle. During the lifting operation, personnel are strictly prohibited from operating or passing through the swinging range of the water cutting machine, and operations are also prohibited below the water cutting machine.

[0120] It should be noted that according to the geological exploration data, the approximate position of the oil and gas well pipeline is determined. When the remaining exposure distance of the working face is 5m, a position exploration hole is drilled from the working face to the construction position in the pushing and mining direction to determine the specific position of the oil and gas well pipeline. The coal walls on both sides of the pipeline contour line are broken and transported by the coal mining machine. The coal body around the oil and gas well pipeline is broken by manual wind hammers. The following safety measures must be observed during pushing and mining:

[0121] During the use of the coal mining machine to expose the oil and gas well pipeline, strictly follow the marked contour line to cut coal, and do not cut the pipeline directly beyond the marked line.

[0122] Two hand-held pneumatic drills are used for exploration. When exploring, pay attention to the position. When the personnel are working in the machine channel, the machine must be locked and locked, the roof and sides must be knocked, and the operation must be carried out after supporting the imperfect roof and sides. The personnel face the sides, hold the drill well during the operation of the drill, and prevent the drill from being injured.

[0123] The condition of the roof and sides, drill and drill rod must be paid attention to at all times. If unsafe hidden dangers are found, the drilling must be stopped in time for treatment, and the normal construction can continue after the hidden dangers are eliminated.

[0124] When the remaining exposure distance of the working face is 2.5m, the coal machine slows down when cutting coal in the detection area (20m on both sides). When entering the 5m range, cut the coal at a speed of 2m / min. The coal machine driver observes the coal wall condition at all times.

[0125] When the artificial wind hammer breaks the coal body around the pipeline, it is from top to bottom and away from the construction. No one is allowed within 10m in front and back of the operation site. Stop immediately when encountering the pipeline.

[0126] The vehicle carrying the water cutting machine enters the air return channel, and is transported to the advanced support. The water cutting machine is not allowed to be unloaded by rolling off the vehicle compartment. The water cutting machine is unloaded from the vehicle compartment by using a hand-operated hoist. A special hoisting anchor rod is used as a device for hanging the hand-operated hoist. A 40T chain is sleeved on the exposed anchor cable to install a tray and a lock. The two ends of the 40T chain are connected by using a horseshoe ring. The hand-operated hoist is hung in the 40T chain. The vehicle is reversed so that the water cutting machine is below the hand-operated hoist. After the vehicle is turned off, the horse trough of the vehicle compartment is opened. The hook of the hand-operated hoist is hung on the water cutting machine. The small chain is pulled so that the water cutting machine is 100 mm higher than the bottom plate of the vehicle compartment. The driver is instructed to drive slowly forward for 10 m. The operator pulls the small chain of the hand-operated hoist to place the water cutting machine on the bottom plate.

[0127] Before high-pressure water cutting, the power is cut off and locked when entering the transport channel. The roof and sides are knocked. Only the water pump and lighting power supply are retained. A special pipe clamp, hand-operated hoist and 40T chain ring must be used to fix the water cutting machine in advance. When fixing the pipeline, the 40T chain ring is connected by using a horseshoe ring. The horseshoe ring must be locked by using a high-strength screw. The high-strength screw protrudes from the nut by not less than 2 cm. The split ring is strictly prohibited.

[0128] During high-pressure water cutting, the operator needs to be far away from the direction of high-pressure mortar water jet and reflection to prevent injury. During cutting, the cutting condition is judged according to the reflection of the jet (high jet reflection indicates that the workpiece has not been cut through; the jet is obliquely downward, which is the best cutting state; if the jet is vertically downward, it indicates that the cutting speed can be increased).

[0129] During high-pressure water cutting, a portable four-in-one gas detector is hung at a distance of 5 m from the downwind side of the operation point. When the pipeline cut is more than 1 cm, cutting is immediately stopped. The rescue team checks the gas and water discharge. If there is an abnormality, on-site measures are taken to handle the situation.

[0130] During high-pressure water cutting, the ground monitoring and control console closely monitors the sensor alarm of the tail safety outlet or the air return channel of the working face sensor. When the gas concentration exceeds 1.0%, the ground monitoring and control console notifies the underground to immediately stop construction, cuts off the power supply, evacuates the personnel, and timely reports to the ventilation technical management room and the production scheduling management room to take measures to handle the situation. If the gas concentration exceeds 1%, the construction is immediately stopped, the power supply is cut off, the personnel are evacuated, and measures are taken to handle the situation.

[0131] The oil and gas well cutting sequence is from bottom to top, the anti-falling rope is hung, and is tied on the hydraulic support to prevent the well section from falling down and hurting people after the upper and lower parts of the oil and gas well are completely cut off. The oil and gas well pipeline is cut by the water cutting machine, each of the upper and lower parts of the oil and gas well is dug by 20 cm, the upper end is fixed by using a 40T chain and a hand-operated hoist, the bottom of the oil and gas pipeline is cut first, after the gas and water are treated, the upper pipeline is cut, the oil and gas pipeline must be kept firm during the whole process to prevent the operation personnel from being hurt (the personnel are constructed at a distance of 1 m), the warning must be set outside 30 m, no one is allowed to enter the cutting area during the operation except the operator, and the upper and lower ends are blocked after the cutting to prevent the pipeline from sliding or the gas from leaking.

[0132] After the pipeline is cut, the bottom plate is blocked and covered, and the top plate is matched with an iron plate to be welded and compacted (the diameter of the iron plate disc is slightly larger than the outer diameter of the outer sleeve of the oil and gas well to ensure that the cutting surface of the oil and gas well can be covered), so as to prevent the top plate from collapsing, the residual oil and gas in the well from leaking, and the poisonous and harmful gas in the goaf and working face from exceeding the standard, and even the goaf from self-igniting and firing to fix the pipeline in the chute of the conveyer and transport it out of the working face.

[0133] As can be seen from the above, the water cutting device and the water cutting machine provided by the application for cutting the oil and gas well in the oil and gas superimposed area can make the coal mining face smoothly advance and realize the smooth mining of the upper coal seam in the oil and gas superimposed area, and form a comprehensive utilization, safe and reliable pattern of coordinated mining of coal mines and deep oil and natural gas.

[0134] In the description provided herein, a large number of specific details are explained. However, it can be understood that the embodiments of the application can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the present description.

[0135] In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments but not others, the combination of features of different embodiments also means to be within the protection scope of the application and form different embodiments. For example, in the above embodiments, those skilled in the art can use in a combined manner according to the known technical solutions and the technical problems to be solved by the present application.

[0136] The above is only the preferred embodiment of the application, and does not limit the application in any form. Although the application has been disclosed as above with the preferred embodiment, it is not intended to limit the application. Any skilled person in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the application, and form equivalent embodiments with equivalent changes. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the application are still within the scope of the application.

Claims

1. A water jet device for cutting a coal gas play well, characterized in that, include: The clamp component adjusts its inner diameter according to the outer diameter of the oil and gas well, so that the clamp component can be tightly clamped to the outer circumference of the oil and gas well. The connecting rod assembly comprises a connecting part and a rotating part capable of circumferential rotation on the connecting part; wherein the connecting part is fixedly connected to the clamp assembly; The water jet head is inserted into the rotating part, and the high-pressure water jet ejected from the water jet head can vertically hit the outer circumferential surface of the oil and gas well, so that it can horizontally cut the oil and gas well. The water pipe is connected to the high-pressure water outlet equipment. The operator swings the water pipe to make the water pipe head swing together, thereby forming a fan-shaped spray area. The clamp component includes: A flexible connector that can be wound around the outer circumferential surface of the oil and gas well; A rigid connector has an arc-shaped side facing the oil and gas well, which is used to fit against the outer circumferential surface of the oil and gas well. One lateral end of the rigid connector is hinged to one free end of the flexible connector, and the other lateral end of the rigid connector is provided as a snap-fit ​​part. A locking component is connected between the other free end of the flexible connector and the snap-fit ​​part, used to adjust the inner diameter of the ring formed by the flexible connector and the rigid connector, and to lock the flexible connector and the rigid connector on the outer circumferential surface of the oil and gas well. The locking component includes: A threaded column, one end of which is hinged to the flexible connector, and the middle part is engaged in the engagement part with a clearance fit between them; The threaded sleeve consists of a hollow internal threaded sleeve and a handle, and has an overall T-shaped structure. The internal threaded sleeve is screwed into the threaded column. After rotating the handle, the internal threaded sleeve is rotated together. Under the action of the internal and external threads, the internal threaded sleeve converts the circumferential rotational motion into axial linear motion to push the snap-fit ​​part toward the oil and gas well, thereby clamping the flexible connector and the rigid connector onto the outer circumferential surface of the oil and gas well. The rigid connector is integrally cast or welded from a right-angled triangular plate with a concave arc side and a U-shaped clamping plate located at the right angle of the right-angled triangular plate. The U-shaped clamping plate is used as the clamping part. The central area of ​​the right-angled triangular plate is provided with a through hole for use with the connecting rod component, and a hinge hole is provided at one acute angle of the right-angled triangular plate for inserting a pin and hinged to the flexible connector. The connecting rod component includes: A vertically arranged connecting rod, the top of which is connected to the clamp component by a first fastener; A horizontally arranged support rod, one end of which is fixed to the bottom of the connecting rod; A vertically arranged rotating rod is located below the support rod. The top of the rotating rod is connected to the middle region of the support rod by a second fastener, and the rotating rod can rotate circumferentially around its center point. A radial through hole is provided in the middle region of the outer circumference of the rotating rod. The water spray head is inserted into the radial through hole and fixed by a third fastener.

2. The water jet device for cutting the oil and gas well of the coal oil and gas superimposed area according to claim 1, characterized in that: The top of the connecting rod is provided with a stepped head with external threads, and the stepped head is inserted into the through hole of the clamp component from bottom to top; The first fastener is a nut which is screwed on the stepped head to press the shoulder at the stepped head against the clamping component, thereby fixing the connecting rod and the clamping component together.

3. The water jet device for cutting oil and gas well of coal oil and gas superimposed area according to claim 1, characterized in that: The middle region of the support rod is provided with a vertical through hole, and the axial top surface central region of the rotating rod is provided with an axial internal thread blind hole coaxially arranged with the through hole; The second fastener is a screw, the threaded rod of which is inserted into the through hole from top to bottom and is pressed against the axial internal thread blind hole, the threaded rod of the screw is in clearance fit with the through hole, and the length of the threaded rod of the screw is greater than the depth of the through hole and the axial internal thread blind hole added together, so that the rotating rod and the screw can axially move on the support rod, thereby realizing the circumferential rotation function of the rotating rod; The axial bottom surface central region of the rotating rod is provided with an axial internal thread mounting hole which is in communication with the radial through hole; The third fastener is a screw, the threaded rod of which is screwed into the axial internal thread mounting hole and is pressed against the water jet pipe head, thereby fixing the water jet pipe head with the spacing between the end of the water jet pipe head and the outer circumferential surface of the oil and gas well adjusted on the rotating rod.

4. A cutting method of the water jet device for cutting the oil and gas well in the coal oil and gas superposition area according to any one of claims 1 to 3, characterized in that: The position of the pre-cutting is determined on the outer circumferential surface of the oil and gas well, and a cutting position mark is made; The clamping component is clamped on the oil and gas well above the cutting position mark; The position of the connecting rod component is adjusted and then fixed on the clamping component; The spacing between the water jet pipe head and the outer circumferential surface of the oil and gas well is adjusted and then the water jet pipe head is fixed on the connecting rod component; Two operators are needed during cutting, one of whom is responsible for operating the high-pressure equipment and observing its running state, and the other is responsible for cutting; The water inlet valve is opened, the water jet pipe head has a water jet, the high-pressure water outlet equipment is started, and cutting is started when the mortar jet is basically formed; during cutting, the operator forms a fan-shaped jet by swinging the water pipe. After cutting, the cut of the oil and gas well is plugged to prevent gas leakage.

5. A water cutting machine comprising a high-pressure water outlet device, characterized by: The water jet device for cutting the oil and gas well in the coal oil and gas superposition area according to any one of claims 1 to 3 is also included.

6. A method of construction based on the water cutting machine according to claim 5, characterized in that, The method mainly includes the following steps: Step one, preparation work before the oil and gas well casing is exposed; Step two, oil and gas well exploration and exposure during the coal mine working face pushing and mining process; Step three, transportation of the underground water cutting machine; Step four, preparation before the installation of the water cutting machine; Step five, installation of the underground water cutting machine; Step six, test of the underground water cutting machine; Step seven, cutting of the underground oil and gas pipeline; Step eight, recovery of the underground water cutting machine.

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